USGS WPhase Moment Solution

OFF COAST OF WASHINGTON

12/08/19  8:07:36

Epicenter:  47.772 -128.625
MW 5.6

USGS/WPHASE CENTROID MOMENT TENSOR
12/08/19 08:07:36.00
Centroid:   47.572 -128.923
Depth  11         No. of sta: 35
Moment Tensor;   Scale 10**17 Nm
  Mrr=-0.32       Mtt=-2.64
  Mpp= 2.96       Mrt=-1.12
  Mrp= 1.61       Mtp=-0.32
 Principal axes:
  T  Val=  3.71  Plg=23  Azm=262
  N     = -0.59      55      133
  P     = -3.12      23        3

Best Double Couple:Mo=3.5*10**17
 NP1:Strike= 43 Dip=56 Slip=   0
 NP2:       133     90      -145

Moment Tensor Solution
The figure above shows a visual representation of the style of faulting (focal mechanism) derived from the estimated moment tensor. Shaded areas show quadrants of the focal sphere in which the P-wave first-motions are away from the source, and unshaded areas show quadrants in which the P-wave first-motions are toward the source. The dots represent the axis of maximum compressional strain (in black, called the "P-axis") and the axis of maximum extensional strain (in white, called the "T-axis") resulting from the earthquake.

Moment Tensor Solution

Details on the W-phase inversion algorithm.